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 Robotics / 2510
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Subject: 
IR Line of Sight (was: Re: Fw: RcxCC Joystick controls)
Newsgroups: 
lugnet.robotics
Date: 
Thu, 7 Jan 1999 21:16:14 GMT
Original-From: 
Don Hewitt <donhewitt@worldnet.att.netANTISPAM>
Viewed: 
1493 times
  
I've had pretty good results by elevating the IR Tower (it stands on the
computer desk), pointing the IR Tower toward the center of the room, and
mounting the RCX so that its IR port is pointing up (make sure it is the
highest point on the robot).

I've been able to drive around the room, even when I don't have direct line
of sight.  It seems to work up to at least 10-12 feet away in this
configuration, and you can turn the robot around in circles without
introducing any directional problems.   I must be getting good reflections
from the ceiling / walls / or other objects in the room.

Make sure that you set both ends of the IR connection to long-range, and
avoid driving under tables or couches!

Don Hewitt

At 11:47 AM 1/7/99 -0600, Tom Rowton wrote:
I've given a bit of thought to the line of sight prob with the IR receiver
on the RCX and have come up with an idea that should help, as long as the
RCX and the IR tower have line of sight, no matter which direction the RCX
is facing.

Lego purists - delete this message now. Read no further.  <wink>

Make a small mirror apparatus like the ones used to film in 360 degrees.
There may be new tech, but when I saw how it was done, filmers had multiple
cameras facing the sky, but pointed at a mirrors(45 degrees from camera's 0)

Basically, you need a miniature disco ball poised above the IR receiver to
bounce transmissions no matter which direction you are facing. I know this
should work, as I do it with my TV remote all the time.

Alternately, you could coat all surfaces in your house with mirrors, but...

trowt

<snip>

--
Did you check the web site first?: http://www.crynwr.com/lego-robotics



Message has 2 Replies:
  Re: IR Line of Sight (was: Re: Fw: RcxCC Joystick controls)
 
Sending to you directly b/c lugnet won't recognize my posts (though I've already registered with them!). Assuming the walls and ceiling of your room are painted white (I read someone quoting >70% reflectivity for IR w/ white surfaces). Would the (...) (26 years ago, 7-Jan-99, to lugnet.robotics)
  Re: IR Line of Sight (was: Re: Fw: RcxCC Joystick controls)
 
This is similar to what I have done. My IR tower is on a table, about 2.5 feet off the ground. It faces the center of the room, bouncing off a wall that is about 10-12 feet from the tower. The RCX is lying flat on the top of the robot platform, and (...) (26 years ago, 8-Jan-99, to lugnet.robotics)

Message is in Reply To:
  Fw: RcxCC Joystick controls
 
I've given a bit of thought to the line of sight prob with the IR receiver on the RCX and have come up with an idea that should help, as long as the RCX and the IR tower have line of sight, no matter which direction the RCX is facing. Lego purists - (...) (26 years ago, 7-Jan-99, to lugnet.robotics)

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